HyperText Markup Language (HTML).
A standard notation for describing the web's documents.
Control the appearance of web page & its content.
Make an online form for enrollment, online transaction.
Add the objects, e.g., image, audio and video in the document.
  

HTML Tools.
Browser.
Installed software that turns HTML tags into web pages.
E.g., Chrome, Edge, Firefox, Safari, Opera.
Editor.
Program for creating HTML documents.
E.g., Visual Studio Code, Notepad++, Sublime Text, Vim.